Too perfect. That's the rub and the death knell for Romney. He has no rough edges. No one can identify with that.
Harper's has the definitive piece on why Romney's campaign is ultimately doomed. It's all in the Romney 2008 internal PowerPoint plan:
The problems holding him back were all identified in the campaign’s PowerPoint presentation: the Massachusetts background, the image of slickness, the fears about his religion, and, above all, mistrust of his ideological transformation. Romney and his handlers portray him as having undergone a political conversion, but they can’t point to any convincing catalyst. ...
The “electorate is not where it needs to be for us to succeed,” his campaign PowerPoint had concluded; hence, the strategy has been to move Romney where he needs to be to succeed.